Toner concentration detecting device for dry type electrographic

Details Toner concentration detecting device for dry type electrographic Toner concentration detecting device for dry type electrographic

1986-07-25

1987-08-04

Grimley, Arthur T.

Photocopying

Including fiber optics

355 14D, 118691, G03G 1508

Patent

active

046842365

ABSTRACT:
In a toner concentration detecting device wherein developer is carried by a roll from a developer flowpath to a detection station for optical detection thereof, a restriction element is provided adjacent the roll between the developer flowpath and detection station to limit the thickness of the developer adhered to the roll. A scraper is provided downstream of the detection station for cleaning the roll, and the roll itself is covered with a non-magnetic material to provide a substantially smooth outer surface.

REFERENCES:
patent: 3897748 (1975-08-01), Hirata et al.
patent: 3928764 (1975-12-01), Bock et al.
patent: 4419960 (1983-12-01), Okamura et al.

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